Flexible circuit board

Abstract

The utility model discloses a flexible circuit board, which is characterized in that a plurality of signal transmission metal wires are arranged between a first insulating base film and a second insulating base film at intervals, and a left metal lead and a right metal lead are respectively arranged on two sides of each signal transmission metal wire in parallel at intervals; a first shielding layer is arranged on the surface of the side, opposite to the signal transmission metal wire, the left metal wire and the right metal wire, of the first insulating base film, and a second shielding layer is arranged on the surface of the side, opposite to the signal transmission metal wire, the left metal wire and the right metal wire, of the second insulating base film. The two ends of the signal transmission metal wires, the two ends of the left metal wire and the two ends of the right metal wire are connected with the first interface terminal and the second interface terminal respectively, and an adhesive layer is arranged between the first insulating base film and the second insulating base film. According to the utility model, the stability of signal transmission of the flexible circuit board is improved, the situation of signal attenuation is reduced, and the overall anti-interference performance is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit boards, in particular to a flexible circuit board. Background Art

[0002] Flexible printed circuit board (FPC) is a highly reliable and highly flexible printed circuit board made of polyimide or polyester film. The circuits of the flexible circuit board need to be connected to other circuits by installing terminal connectors, and all the circuits of the flexible circuit board will eventually be concentrated at the end of the terminal connector.

[0003] However, the spacing between the circuits of the existing flexible circuit board is small. When the flexible circuit board is used to transmit data signals, signal attenuation is likely to occur, and the circuits interfere with each other, resulting in poor stability of signal transmission. Utility Model Content

[0004] The purpose of the utility model is to provide a flexible circuit board, which is beneficial to improving the stability of signal transmission of the flexible circuit board, reducing the situation of signal attenuation, and also improving the overall anti-interference performance.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a flexible circuit board, comprising: a first interface terminal, a second interface terminal, and a first insulating base film and a second insulating base film stacked between the first interface terminal and the second interface terminal, a plurality of signal transmission metal wires are arranged at intervals between the first insulating base film and the second insulating base film, and first metal wires are arranged at intervals on both sides of each signal transmission metal wire;

[0006] A first shielding layer is provided on the surface of the first insulating base film opposite to the signal transmission metal wire and the first metal wire, and a second shielding layer is provided on the surface of the second insulating base film opposite to the signal transmission metal wire and the first metal wire. The two ends of each of the signal transmission metal wires are electrically connected to the first interface terminal and the second interface terminal respectively.

[0007] The further improved scheme in the above technical scheme is as follows:

[0008] 1. In the above scheme, it also includes a plurality of second signal transmission metal wires and at least one third interface terminal. The first insulating base film includes a first insulating base film body and at least one first insulating base film branch connected to the first insulating base film body. The second insulating base film includes a second insulating base film body and at least one second insulating base film branch connected to the second insulating base film body. The third interface terminal is connected to the stacked first insulating base film branches and second insulating base film branches. Second metal wires are arranged on both sides of each second signal transmission metal wire in parallel and at intervals. One end of the second signal transmission metal wire located between the first insulating base film branch and the second insulating base film branch is electrically connected to the third interface terminal.

[0009] 2. In the above solution, the first metal wire, the second metal wire, the first interface terminal, the second interface terminal, and the third interface terminal are electrically connected.

[0010] 3. In the above solution, the first shielding layer and the second shielding layer are metal shielding films or metal shielding meshes.

[0011] 4. In the above scheme, a first insulating film is arranged between the first insulating base film and the first shielding layer, and a second insulating film is arranged between the second insulating base film and the second shielding layer.

[0012] 5. In the above solution, an adhesive layer is provided between the first insulating base film and the second insulating base film.

[0013] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0014] 1. The utility model flexible circuit board, wherein the first insulating base film and the second insulating base film are stacked between the first interface terminal and the second interface terminal, a plurality of signal transmission metal wires are arranged at intervals between the first insulating base film and the second insulating base film, and first metal wires are arranged in parallel and at intervals on both sides of each signal transmission metal wire; a first shielding layer is arranged on the surface of the first insulating base film on the side opposite to the signal transmission metal wire and the first metal wire, and a second shielding layer is arranged on the surface of the second insulating base film on the side opposite to the signal transmission metal wire and the first metal wire, and a plurality of signal transmission metal wires are respectively electrically connected to the first interface terminal and the second interface terminal at both ends, and the first interface terminal and the second interface terminal are electrically connected through the signal transmission metal wire, and while the signal transmission metal wire is transmitting a signal, the first metal wires on both sides of the signal transmission metal wire and the first shielding layer and the second shielding layer on the upper and lower sides of the signal transmission metal wire jointly form a shielding protection for the signal transmission metal wire, which is beneficial to improving the stability of signal transmission of the flexible circuit board, reducing the situation of signal attenuation, and improving the overall anti-interference performance.

[0015] 2. In the flexible circuit board of the utility model, the third interface terminal is connected to the stacked first insulating base film branch and the second insulating base film branch, and second metal wires are arranged in parallel and at intervals on both sides of each second signal transmission metal wire. One end of the second signal transmission metal wire between the first insulating base film branch and the second insulating base film branch is electrically connected to the third interface terminal, and the third interface terminal is electrically connected through the second signal transmission metal wire. On the basis of realizing multi-port signal transmission, the second metal wires on both sides of the second signal transmission metal wire cooperate with the first shielding layer and the second shielding layer, which is beneficial to improving the anti-interference performance between the ports, realizing the stable transmission of signals between multiple ports, and improving the overall applicability of the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the overall structure of the flexible circuit board of the utility model;

[0017] Attached Figure 2 It is a partial cross-sectional schematic diagram of the first embodiment of the utility model;

[0018] Attached Figure 3 This is a schematic diagram of the internal structure of the second embodiment of the utility model;

[0019] Attached Figure 4 For the utility model Figure 3 A-A' cross-sectional schematic diagram;

[0020] Attached Figure 5 For the utility model Figure 3 Schematic diagram of the B-B' section.

[0021] In the above drawings: 100, first interface terminal; 200, second interface terminal; 300, third interface terminal; 1, signal transmission metal wire; 21, first metal conductor; 22, second metal conductor; 3, first insulating base film; 31, first insulating base film body; 32, first insulating base film branch; 4, second insulating base film; 41, second insulating base film body; 42, second insulating base film branch; 51, first insulating film; 52, second insulating film; 61, first shielding layer; 62, second shielding layer; 7, adhesive layer; 8, second signal transmission metal wire. DETAILED DESCRIPTION

[0022] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0023] Embodiment 1: A flexible circuit board, comprising: a first interface terminal 100, a second interface terminal 200, and a first insulating base film 3 and a second insulating base film 4 stacked between the first interface terminal 100 and the second interface terminal 200, a plurality of signal transmission metal wires 1 are arranged between the first insulating base film 3 and the second insulating base film 4, and first metal wires 21 are arranged in parallel and spaced on both sides of each signal transmission metal wire 1;

[0024] The first interface terminal and the second interface terminal are electrically connected through the signal transmission metal wire, and while the signal transmission metal wire is transmitting the signal, the first metal wire located on both sides of the signal transmission metal wire and the first shielding layer and the second shielding layer located on the upper and lower sides of the signal transmission metal wire jointly form shielding protection for the signal transmission metal wire, which is beneficial to improving the stability of signal transmission of the flexible circuit board, reducing signal attenuation, and improving the overall anti-interference performance;

[0025] A first shielding layer 61 is provided on the surface of the first insulating base film 3 opposite to the signal transmission metal wire 1 and the first metal wire 21, and a second shielding layer 62 is provided on the surface of the second insulating base film 4 opposite to the signal transmission metal wire 1 and the first metal wire 21. The two ends of each of the plurality of signal transmission metal wires 1 are electrically connected to the first interface terminal 100 and the second interface terminal 200, respectively.

[0026] The device further comprises a plurality of second signal transmission metal wires 8 and at least one third interface terminal 300. The first insulating base film 3 comprises a first insulating base film body 31 and at least one first insulating base film branch 32 connected to the first insulating base film body 31. The second insulating base film 4 comprises a second insulating base film body 41 and at least one second insulating base film branch 42 connected to the second insulating base film body 41.

[0027] The above-mentioned third interface terminal 300 is connected to the stacked first insulating base film branch 32 and the second insulating base film branch 42, and second metal conductors 22 are arranged in parallel and at intervals on both sides of each second signal transmission metal wire 8, and one end of the second signal transmission metal wire 8 located between the first insulating base film branch 32 and the second insulating base film branch 42 is electrically connected to the above-mentioned third interface terminal 300.

[0028] The first metal wire 21 , the second metal wire 22 are electrically connected to the first interface terminal 100 , the second interface terminal 200 , and the third interface terminal 300 .

[0029] The first shielding layer 61 and the second shielding layer 62 are metal shielding films.

[0030] An adhesive layer 7 is disposed between the first insulating base film 3 and the second insulating base film 4 .

[0031] The first insulating base film 3 and the second insulating base film 4 are PVC films.

[0032] The left metal wire 21 and the right metal wire 22 have the same diameter.

[0033] Embodiment 2: A flexible circuit board, comprising: a first interface terminal 100, a second interface terminal 200, and a first insulating base film 3 and a second insulating base film 4 stacked between the first interface terminal 100 and the second interface terminal 200, a plurality of signal transmission metal wires 1 are arranged at intervals between the first insulating base film 3 and the second insulating base film 4, and first metal wires 21 are arranged at intervals on both sides of each signal transmission metal wire 1;

[0034] A first shielding layer 61 is provided on the surface of the first insulating base film 3 opposite to the signal transmission metal wire 1 and the first metal wire 21, and a second shielding layer 62 is provided on the surface of the second insulating base film 4 opposite to the signal transmission metal wire 1 and the first metal wire 21. The two ends of each of the plurality of signal transmission metal wires 1 are electrically connected to the first interface terminal 100 and the second interface terminal 200, respectively.

[0035] The device further comprises a plurality of second signal transmission metal wires 8 and at least one third interface terminal 300. The first insulating base film 3 comprises a first insulating base film body 31 and at least one first insulating base film branch 32 connected to the first insulating base film body 31. The second insulating base film 4 comprises a second insulating base film body 41 and at least one second insulating base film branch 42 connected to the second insulating base film body 41.

[0036] The third interface terminal is electrically connected through the second signal transmission metal wire. On the basis of realizing multi-port signal transmission, the second metal wires located on both sides of the second signal transmission metal wire cooperate with the first shielding layer and the second shielding layer, which is conducive to improving the anti-interference performance between the ports, realizing stable transmission of signals between multiple ports, and improving the overall applicability of the flexible circuit board;

[0037] The above-mentioned third interface terminal 300 is connected to the stacked first insulating base film branch 32 and the second insulating base film branch 42, and second metal conductors 22 are arranged in parallel and at intervals on both sides of each second signal transmission metal wire 8, and one end of the second signal transmission metal wire 8 located between the first insulating base film branch 32 and the second insulating base film branch 42 is electrically connected to the above-mentioned third interface terminal 300.

[0038] The first shielding layer 61 and the second shielding layer 62 are metal shielding meshes.

[0039] A first insulating film 51 is disposed between the first insulating base film 3 and the first shielding layer 61 , and a second insulating film 52 is disposed between the second insulating base film 4 and the second shielding layer 62 ; the first insulating film 51 and the second insulating film 52 are PET films.

[0040] The first insulating base film 3 is a PBT film, and the second insulating base film 4 is a PI film.

[0041] The signal transmission metal wires 1 are arranged at equal intervals.

[0042] As further described below, the first insulating base film 3, the second insulating base film 4, the first insulating film 51, and the second insulating film 52 can each be made of any one of PET film, PBT film, PVC film, PE film, or PI film.

[0043] When the above-mentioned flexible circuit board is used, the first interface terminal and the second interface terminal are electrically connected through the signal transmission metal wire, and while the signal transmission metal wire is transmitting the signal, the first metal wire located on both sides of the signal transmission metal wire and the first shielding layer and the second shielding layer located on the upper and lower sides of the signal transmission metal wire jointly form shielding protection for the signal transmission metal wire, which is beneficial to improving the stability of signal transmission of the flexible circuit board, reducing the signal attenuation, and improving the overall anti-interference performance;

[0044] In addition, the third interface terminal is electrically connected through the second signal transmission metal wire. On the basis of realizing multi-port signal transmission, the second metal wires located on both sides of the second signal transmission metal wire cooperate with the first shielding layer and the second shielding layer, which is beneficial to improving the anti-interference performance between each port, realizing stable transmission of signals between multiple ports, and improving the overall applicability of the flexible circuit board.

[0045] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A flexible circuit board, characterized in that: include: A first insulating base film (3) and a second insulating base film (4) are stacked between the first interface terminal (100) and the second interface terminal (200); a plurality of signal transmission metal wires (1) are arranged at intervals between the first insulating base film (3) and the second insulating base film (4); and first metal conductors (21) are arranged in parallel and at intervals on both sides of each signal transmission metal wire (1); A first shielding layer (61) is provided on a surface of the first insulating base film (3) opposite to the signal transmission metal wire (1) and the first metal wire (21); a second shielding layer (62) is provided on a surface of the second insulating base film (4) opposite to the signal transmission metal wire (1) and the first metal wire (21); and two ends of each of the plurality of signal transmission metal wires (1) are electrically connected to a first interface terminal (100) and a second interface terminal (200), respectively.

2. The flexible circuit board according to claim 1, characterized in that: The invention also comprises a plurality of second signal transmission metal wires (8) and at least one third interface terminal (300); the first insulating base film (3) comprises a first insulating base film body (31) and at least one first insulating base film branch (32) connected to the first insulating base film body (31); the second insulating base film (4) comprises a second insulating base film body (41) and at least one second insulating base film branch (42) connected to the second insulating base film body (41); the third interface terminal (300) is connected to the stacked first insulating base film branch (32) and the second insulating base film branch (42); second metal conductors (22) are arranged in parallel and at intervals on both sides of each second signal transmission metal wire (8); one end of the second signal transmission metal wire (8) between the first insulating base film branch (32) and the second insulating base film branch (42) is electrically connected to the third interface terminal (300).

3. The flexible circuit board according to claim 1, characterized in that: The first metal wire (21), the second metal wire (22), the first interface terminal (100), the second interface terminal (200), and the third interface terminal (300) are electrically connected.

4. The flexible circuit board according to claim 1, characterized in that: The first shielding layer (61) and the second shielding layer (62) are metal shielding films or metal shielding meshes.

5. The flexible circuit board according to claim 1, characterized in that: A first insulating film (51) is provided between the first insulating base film (3) and the first shielding layer (61), and a second insulating film (52) is provided between the second insulating base film (4) and the second shielding layer (62).

6. The flexible circuit board according to claim 1, characterized in that: An adhesive layer (7) is provided between the first insulating base film (3) and the second insulating base film (4).

Images